Revert "Update openstack_version to rocky"

This reverts commit b931c7250ad54b19af42201654bff3052335b51f.

Change-Id: I41b78ebd799887588a2023d7c6481f5ae3ba3ce9
diff --git a/classes/cluster/virtual-mcp11-aio/openstack/init.yml b/classes/cluster/virtual-mcp11-aio/openstack/init.yml
index 4b62aed..3f9b2d0 100755
--- a/classes/cluster/virtual-mcp11-aio/openstack/init.yml
+++ b/classes/cluster/virtual-mcp11-aio/openstack/init.yml
@@ -42,7 +42,7 @@
 - service.runtest.tempest
 parameters:
   _param:
-    openstack_version: rocky
+    openstack_version: queens
     openstack_node_role: primary
     cluster_public_host: ${_param:single_address}
     cluster_public_protocol: http